Sort Joins by Failure Mode

Sort each lookup symptom into the likely failure mode. Missing key Duplicate key Wrong match mode Data type mismatch #N/A for recently added accounts One customer returns two different territories Approximate match returns the previous product code IDs look equal but one column is text and one is number New SKU has no category after refresh Account name maps to two CRM IDs Sorted lookup changes when source order changes Leading zeros disappear from ZIP-style IDs

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